Question

3 What is the force of gravity between the earth and mass of
20 kg placed on its surface?
[Ans. 1961​

Answer 1

Explanation:

F = (G×M×m)/r^2. G= universal gravitational constant 6.67408 × 10^-11 m^3 kg^-1 s^-2. M= mass of the earth i.e. 6×10^24 kg, m=mass of the object i.e. 20kg here. r = radius of earth + radius of the object. As radius of earth >>radius of the object, we can ignore its value and take r =radius of earth i.e. 6400km.

So, the gravitional force is 20×9.8 N = 196 N.

You can do the calculation by putting the values in the above mentioned equation.

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Answer 2

Answer:

20 * 9.8 =196 its surface answer is not 1961